<div class="col-xs-6 col-sm-3 sidebar-offcanvas" id="sidebar" role="navigation">
    <div class="list-group">
        <a href="<?php echo site_url('email') ?>" class="list-group-item <?php echo is_show(array($base_class => 'email'), 'active') ?>">任务列表</a>
        <a href="<?php echo site_url('email_user') ?>" class="list-group-item <?php echo is_show(array($base_class => 'email_user'), 'active') ?>">发件账号</a>
        <a href="#" class="list-group-item">收件账号</a>
        <a href="#" class="list-group-item">内容编辑</a>
        <a href="#" class="list-group-item">发送设置</a>
        <a href="#" class="list-group-item">发送日记</a>
    </div>
</div><!--/span-->